+

Current

Limit

Thermal

Shutdown

IN

OUT

GND

LM2936

PNP

Bandgap

Reference

LM2936

SNOSC48O – JUNE 2000 – REVISED DECEMBER 2014

www.ti.com

7 Detailed Description

7.1 Overview

The LM2936 ultra-low quiescent current regulator features low dropout voltage and low current in the standby

mode. With less than 15

μA quiescent current at a 100-μA load, the LM2936 is ideally suited for automotive and

other battery operated systems. The LM2936 retains all of the features that are common to low dropout

regulators including a low dropout PNP pass device, short circuit protection, reverse battery input protection, and

thermal shutdown. The LM2936 has a 40-V maximum operating voltage limit, a

−40°C to 125°C operating

temperature range, and ±3% output voltage tolerance over the entire output current, input voltage, and

temperature range.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 High Input Operating Voltage

packages, full output current cannot be ensured for all combinations of ambient temperature and input voltage.

While the LM2936HV maintains regulation to 60 V, it will not withstand a short circuit to ground on the output

the LM2936 will break down with catastrophic effects on the regulator and possibly the load as well. Do not use

this device in a design where the input operating voltage may exceed 40 V, or where transients are likely to

exceed 60 V.

7.3.2 Thermal Shutdown (TSD)

The TSD circuitry of the LM2936 has been designed to protect the device against temporary thermal overload

conditions. The TSD circuitry is not intended to replace proper heat-sinking. Continuously running the LM2936

device at TSD may degrade device reliability as the junction temperature will be exceeding the absolute

maximum junction temperature rating. If the LM2936 goes into TSD mode, the output current will be shut off until

the junction temperature falls approximately 10°C, then the output current will automatically be restored. The

LM2936 will continuously cycle in and out of TSD until the condition is corrected. The LM2936 TSD junction

temperature is typically 160°C.

12

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